I now have two Zenith TransOceans and they are both of the 500 series. My question is, how do I know which schematic to use.? I presently have Sams 152-12,Ryder G500 and one titled Model H500, Chassis 5H40.

The G500 is easy, it's in Sam's 83-16. The H500 is a little more difficult. There were five chassis variations of which I have three so far. There are not diagrams readily available for all. Start with the Sam's 152-12 and compare it with your chassis. If different, post the differences here on the forum to see if anyone has the same version with a schematic.

Pat

_________________I'm not a hoarder, I'm a caretaker of scarce commodities

chassis number will be stamped on the rear of the chassis. it may have faded. G500 chassis will have different dial than the H500 and will have a 1S5 instead of a 1U5 for the 1st audio tube. It will also have pin jacks on the back instead of a 1/4 " phone jack. Early H500 chassis will also have the 1S5 tube and the earliest will have the 2 pin jacks on the back instead ofa 1/4 " phone jack. Schematics are almost the same and altho the 1S5 and 1U5 have different pinouts, they are also the same tube. hope this helps.